Stranded cable



July 17, 1928. l 1,677,458

c. A. PARSONS ET AL S TRANDED CABLE Filed May 1I 1922 /nveno/w: Char/es A/gernon @orso/7o, Jesse/ Rosen, i 1 Arf/zur Wa//ace Greyf f Y Rona la' Wa/er /V/'dg/e y, y M www r//zz Af/s,

Patented July 17,'1'7928.

UNITED STATI-:s

PATENT oFF-ica.

`CHARLES ALGERNON PARSONS,I TESSIEL4 :"ROSEN, ARTHUR WALLACE GREY, AND RONALD WALTER MIDGLEY, F NEWCASTLE-ON-TYNE, ENGLAND; SAID ROSEN,

, GREY, AND MIDGLEY AssIeNoRs rro sAID rAnsoNs.

STRANDED CABLE.

Application illed May 1, 1922, Serial No.v557,677', and in Great Britain May 17, 1921.y

The present invention relates tof'helicallyV vstranded cables, that 'is'to say, cables which are'built up of anulnber of successivelayers of Wire of comparatively small section.

While a cable of circular crosssection is often of use, as for example inv armature construction, it is frequently necessary in order, for instance, to build up a conductor to occupy a slot of a shape such as is frequently employed inv dynamo-electric machinery to modify the oval cable so that both ends of the cable section are provided with square corners, that is to say, the cable is of rectangular section.

Hitherto, in order to make a cable of such a shape it has been necessary rst toconstruct a round or oval cable and `then to deform it to the rectangular shape required.

` The crushingof the cable is undesirable, as

in this operationI theinsulationon the in. dividual wires is damaged and short circuits develop. These short circuitsfare harmful where the cable is tted in dynamo-electric machines, as they cause serious overheating ters Patent is zand also reduce the efficiency of the plant.

The object of thepresent invention is to `provide an improved method ofmanufacturing cablesvof 'rectangular section which "shall not involve any process ofdefo-rma- 0 tion and which will, therefore, result in cables' free vfrom-the above-mentioned disadvantages. s

k.The invention-consists in the improvedl 'sion of rectangularlydisposed series of cables hereinafter described and 5 pointed out in the claims.

Referring to the accompanying drawings Figure l is a diagrammatic perspective View of a conductor showing at the left-hand end the arrangement of strands, while Figure 2 is a' similar -view showing the helical laying of successive series of strandsl -This cable is built up of three layers, A, B, C, the centre lines of which are indicated i respectively nby 'dotted lines. The inner layer, A, comprises eight strands, theintermediate layer, B, sinteen and the outer layer', C, twenty-four strands. The increment in the number of strands per layer is thus seen to be eight.

particularly Owing to the helical laying of the super! I jacent series.

imposed. series of strands, cross sections .taken through the cable will showv progresfiguration of the strands will be rectangular as seen in crossl section Vfor any particular serles. C

The cable in the drawing is shown as covered by a lappingv of tape, H.

. It `will 'be seen that by the construction dei scribed we are enabled to producel a cable the section of nwhich lhas four square 4corners, that is tosay, the cable is of rectangular section, andl it is found that with the increments perlayer specified the wires'in each layerv can be easily laid in situ i. e., in the final position desired'without subsequent distortion, without any tendency to over-riding and will remain in the correct position without disturbing their` neighbours either of the same or adjacent layers.

Having now describedour invention, what we claim as new and desire to secure by Let- 1. A method of manufacturing a fiat-surfaced stranded electric conductor of rectangularv cross-section which consists in helically laying in situ a basic:` series of strandssin la two-line rectangular formation as seen in cross-section at recurrent intervals lengthwise of the conductor and helically laying in situ on said, basic series a succesi strands, each series being one-strand thick and having eight more strands than the sub- 2. A fiat-surfaced electric conductor of rectangular,cross-section, comprising a basic series of helically-laid strands in a two-line rectangular formationas seen in cross-sections taken at certain equidistant points along the length of said conductor and superimposed on said basic series a plurality of series of strands helically laid along the sides of a succession oftrectangles, each series'of said plurality being onestrand thick and havinvf eight more strands than the subjacent series.

3. A method of manufacturinga Hat-sur- 1 faced multfstrand conduustcrV of rectangular cross-section,.whichl consists in providing as a core. a body substantially rectangular in cross-section and having transverse dimensions equal respectively to those of an integral number of conductor strands and heli-A cally laying in situ on saidvcore a succession of rectangularly-disposed layers of juxtaposed strands each one strand thick, the

number of strands in said successive layers increasing by eight strands per layer.

In testimony whereof We have signed ourv names to this specification.

CHARLES ALGERNON PARSONS. JESSEL ROSEN. ARTHUR WALLACE GREY. RONALD WALTER MIDGLEY. 

